Alpha-hydroxy carboxylic acid derivates suitable for use in liqu

Details Alpha-hydroxy carboxylic acid derivates suitable for use in liqu Alpha-hydroxy carboxylic acid derivates suitable for use in liqu

1989-06-08

1992-12-01

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229966, 25229967, 560 59, 560 62, 560102, C09K 1912, C07C 6976

Patent

active

051678624

ABSTRACT:
Compounds which may be used as a dopant or host in a ferroelectric chiral smectic liquid crystal mixture. The compounds are characterized in that they are derivates of an X-hydroxy carboxylic acid and contain the chiral unit (I), in which Ro may be alkyl, alkoxy, halogen, formula (II), where b may be 0 to 3 and the phenyl ring may be substituted, and a is 0 or 1. The chiral unit is combined with a range of mesogenic combinations of groups. Lactic acid derivatives are described in detail (i.e. Ro.dbd.methyl) together with various preparative routes, for example the compound formula (III), which has dopant properties in a range of hosts.

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Yoshino, K. et al. Ferroelectrics, 91, 267-76, 1989.
Yoshino, K. et al. Liq. Cryst. 5(4) 1203-11, 1988.
Taniguchi, H. et al. Mol. Cryst. Liq. Cryst. 167, 191-7, 1989.
Taniguchi, H. et al. Jpn. J. Appl. Phys. Part 1, 27(4) 452-5, 1988.

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